Assuming you mean the clutch won't disengage and the system has been bled properly, the pressure plate may be damaged or the clutch disc is installed backwards (if the clutch was just replaced). Also, with some vehicles the clutch master cylinder has to be bench bled before installation.
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The slave cylinder is a hydraulic device that acutuates the clutch. As you depress the clutch pedal it's movement sends hydraulic pressure to the clutch to release it. It's like stepping on the brakes only withe clutch.
How to replace a clutch interlock switch on a 1997 Ford Ranger XLT
Sounds like your clutch disc is worn out and slipping.
you have to have fan clutch wrenches
On the 1996 Ranger the manual shows to lift the clutch pedal every 5,000 miles to adjust the hydraulic clutch , I don't know if yours is the same
you either got air in the hydrolic clutch or the hydrolic clyinder is out .check your fluid level.
On a 1996 Ranger the manual shows to lift the clutch pedal every 5000 miles to adjust the hydraulic clutch - I have no idea if your's is the same
DOT ( 3 ) brake fluid is used for the hydraulic clutch in a Ford Ranger
A 1990 Ford Ranger may not shift into gear if the clutch is out. A clutch can be purchased at any auto parts store.
The clutch slave cylinder for a hydraulic clutch is inside the manual transmission bellhousing